JP3481561B2 - Cell monitoring system and monitoring method in ATM device with multi-PHY device configuration - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a multi-PHY (Ph
TECHNICAL FIELD The present invention relates to a cell monitoring system and method in an ATM (asynchronous transfer mode) device having a physical layer (physical layer) device configuration, and particularly relates to a UTOPIA (Universal T) common to a plurality of physical layer devices.
est and Operation PHY int
AT for monitoring ATM cells on the UTOPIA bus in an ATM device formed by connecting to an ATM layer device via an interface for ATM (utopia) bus.
The present invention relates to an M cell monitoring system and an ATM cell monitoring method.

[0002]

2. Description of the Related Art In the case of an ATM device having a single PHY device configuration in which an ATM layer device and a PHY device are connected 1: 1 via a UTOPIA bus (level 1),
ATM cell monitoring can be performed relatively easily.
For example, when monitoring the number of transmitted cells and the number of received cells, TX
The counts of _SOC (start of transmission cell) and RX_SOC (start of reception cell) correspond to the numbers of transmission cells and reception cells as they are.

[0003]

This conventional monitoring method is applied to an ATM having a multi-PHY device configuration in which a plurality of PHY devices are connected to one ATM layer device via a common UTOPIA bus as shown in FIG. When applied to a device, RX_DATA (received data), RX
Since the cell monitoring circuit that monitors only _SOC cannot identify each PHY device connected to the bus, it is not possible to monitor the ATM cell for each PHY device, and it is possible to transmit and receive to and from multiple PHY devices. Only the total number of cells made is counted.

As a method of solving this problem, a method of separating and monitoring a bus for each PHY device is conceivable.
It is conceivable that the cost will increase due to the increase in the circuit scale and the mounting efficiency will decrease due to the increase in wiring.

A main object of the present invention is to enable monitoring of cells for each PHY device in an ATM device having a multi-PHY device structure without changing the bus structure.

[0006]

SUMMARY OF THE INVENTION A first ATM cell monitoring system of the present invention is an AT on a UTOPIA bus in an ATM device comprising a plurality of physical layer devices connected to an ATM layer device via a common UTOPIA bus.
In a monitoring system for monitoring M cells, among signals output from the ATM layer device to the UTOPIA bus, an individual instruction indicating a transmission instruction of an ATM cell to a physical layer device in a state where the ATM cell can be output and an effective reception state. Of the ATM cell output source physical layer device for identifying the output source physical layer device of the ATM cell, and identifies the output source physical layer device of the specified ATM cell each time the device identification signal is output. , A physical layer device identification unit that outputs an identification result and an ATM cell on the UTOPIA bus are monitored, and every time the identification result is output from the physical layer device identification unit, the ATM cell at that time is identified as the identification result. ATM output from the physical layer device indicated by
An ATM cell monitoring unit that monitors a received ATM cell for each physical layer device by recognizing the cell is a cell.

Further, in the above configuration, the physical layer device identification means may use a reception address signal of a level 2 interface as the device identification signal instead of the reception enable signal.

A second ATM cell monitoring system according to the present invention is an ATM cell composed of a plurality of physical layer devices connected to an ATM layer device via a common UTOPIA bus.
In a monitoring system for monitoring ATM cells on a UTOPIA bus in an apparatus, among signals output from the ATM layer device to the UTOPIA bus, A
The reception instruction of the ATM cell to the physical layer device in the inputtable state of the TM cell and the individual transmission enable signal indicating the effective transmission are monitored as a device identification signal for identifying the physical layer device of the output destination of the ATM cell, Each time a device identification signal is output, the physical layer device identification means for identifying the output destination physical layer device of the designated ATM cell and outputting the identification result, and the ATM cell on the UTOPIA bus are monitored, Every time the identification result is output from the layer device identification means, the ATM cell at that time is recognized as an ATM cell addressed to the physical layer device indicated by the identification result, so that the transmission ATM cell for each physical layer device is recognized. And ATM cell monitoring means for monitoring.

Further, in the above-mentioned configuration, the physical layer device identification means may use a transmission address signal of a level 2 interface as the device identification signal instead of the transmission enable signal.

An ATM layer device of the present invention includes both the first ATM cell monitoring system and the second ATM cell monitoring system.

A first ATM cell monitoring method of the present invention is a monitoring method for monitoring an ATM cell on a UTOPIA bus in an ATM device formed by connecting a plurality of physical layer devices to an ATM layer device via a common UTOPIA bus. In the ATM layer device to the UT
Of the signals output on the OPIA bus, the ATM for the physical layer device in the output enable state of the ATM cell
An individual reception enable signal indicating a cell transmission instruction and valid reception is monitored as a device identification signal for identifying an output source physical layer device of an ATM cell, and is designated each time the device identification signal is output. The physical layer device that is the output source of the ATM cell is identified, and the AT at that time is identified.
By recognizing the M cell as the ATM cell output from the physical layer device indicated by the identification result, there is a step of monitoring the received ATM cell for each physical layer device.

A second ATM cell monitoring method of the present invention is a monitoring method for monitoring an ATM cell on a UTOPIA bus in an ATM device formed by connecting a plurality of physical layer devices to an ATM layer device via a common UTOPIA bus. In the ATM layer device to the UT
Of the signals output on the OPIA bus, ATM for the physical layer device in the input enable state of the ATM cell
A cell reception instruction and an individual transmission enable signal indicating a valid transmission are monitored as a device identification signal for identifying an output destination physical layer device of an ATM cell, and each time the device identification signal is output, it is designated. The physical layer device that is the output destination of the ATM cell is identified, and the AT at that time is identified.
By recognizing the M cell as an ATM cell addressed to the physical layer device indicated by the identification result, there is a step of monitoring the transmission ATM cell for each physical layer device.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the outline of the present invention will be described.
The cell monitoring system of the present invention is characterized in that a PHY device identification circuit is provided in the preceding stage of the cell monitoring circuit, in contrast to the conventional monitoring system in which the cell monitoring circuit directly monitors the UTOPIA bus. The PHY device identification circuit identifies the PHY device from the enable signal of the UTOPIA bus. Therefore, it becomes possible to monitor the ATM cell for each PHY device.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a cell monitoring system of the present invention. In FIG.
The system of this example has PHY devices 10-1 and 10- for realizing a plurality (# 1 to #n) of physical layer functions.
2, ..., 10-n are connected to an ATM layer device 30 for realizing an upper ATM layer function via a common UTOPIA bus 20, and each PHY device 10-1 to 10-n connects the ATM layer device 30 to the ATM layer. Only the portion related to the transfer (reception) of the ATM cell toward the device 30 is shown.

The UTOPIA bus 20 can be composed of only level 1 interface signals. A signal line for receiving ATM cell data (RX_DATA # 1 to RX_DATA # n) output from each PHY device 10-1 to 10-n and a receiving cell start signal (RX_SOC # 1 to R).
The signal lines for X_SOC # n) are connected to a common bus. Each PHY device 10-1 to 10-n
Cell available signals from RX_CLAV # 1 to RX_C
Signal line for LAV # n) and each PHY device 10-
1 to 10-n reception enable signals (RX_ENB #
The signal lines for 1 to RX_ENB # n) are individually connected. The cell availability signal (RX_CLA
V # 1 to RX_CLAV # n are empty cell signals (RX_EMPTY # 1) indicating the opposite states of the cell storage state.
~ RX_EMPTY # n). UTOPIA
There are other clock signals (RX_CLK) and the like on the bus 20, but illustration and description thereof are omitted.

The cell monitoring unit 40 includes a PHY device 10-
, 10-n and PHY device identification circuits 41-1, 41-2, ..., 41-n and ATM cell monitoring circuits 42-1, 42-2 ,. , Cell monitoring circuit), and each PHY device 10
-1 to 10-n output from the ATM layer device 30
The ATM cell (reception cell) received at is monitored.

Each PHY device identification circuit 41-1 to 41
-N, enable signal (R of UTOPIA bus 20)
The corresponding PHY devices 10-1 to 10-n are identified from (X_ENB # 1 to #n). This enable signal indicates to the PHY device that has reported the output of ATM cells that the ATM layer device 30 starts the transmission of ATM cells, and indicates that each PHY device individually receives the ATM cells effectively. It is a signal.

Each PHY device identification circuit 41-1 to 41
The identification result of the PHY device by -n is notified to the corresponding cell monitoring circuits 42-1 to 42-n. Each cell monitoring circuit 42-1 to 42-n can monitor an ATM cell for each PHY device 10-1 to 10-n based on the identification result.

Next, the operation of this embodiment will be described.

First, the operation of the UTOPIA bus 20 will be described with reference to the timing chart of FIG. The ATM layer device 30 includes the PHY devices 10-1 to 10-n.
Cell available signals (RX_CLAV # 1 to RX_CLA) indicating that valid ATM cells are output from the
The PHY device is selected based on V # n), and corresponding enable signals (RX_ENB # 1 to RX_ENB # n) are output to the selected PHY devices 10-1 to 10-n, respectively. Thereby, ATM cell data (RX_DATA # 1 to RX_) from the PHY device selected.
DATA # n) and cell start signals (RX_SOC # 1 to R)
X_SOC # n) is output.

For example, if the PHY device 10-1 is RX
_CLAV # 1 is output, and RX_ENB # 1 is received from the ATM layer device 30 corresponding to the _CLAV # 1, RX_ENB # 1 is received.
The SOC # 1 is output and the output of RX_DATA # 1 is started.

Normally, ATM cells are monitored by these signals (R
X_DATA # 1 to #n, RX_SOC # 1 to #n). However, when there are a plurality of PHY devices 10-1 to 10-n on the UTOPIA bus 20, these signals (RX_DATA # 1 to #n, RX_DATA).
PHY device 10-only from SOC # 1 to #n)
Since the 1 to 10-n cannot be identified, the ATM cell cannot be monitored for each PHY device 10-1 to 10-n.

Therefore, in the present invention, the PHY device 10-
1 to 10-n output cells to the UTOPIA bus 20 when the enable signal (RX_ENB # 1 to #n) is L.
Paying attention to the state of the OW level (significant), by monitoring the state of the enable signals (RX_ENB # 1 to #n), the PHY device 10-1 to 10-n
It is possible to monitor TM cells.

For example, the PHY device identification circuit 41-1 of the cell monitoring unit 40 monitors the enable signal RX_ENB # 1 for the PHY device 10-1 and notifies the cell monitoring circuit 42-1 when a significant state is detected. The cell monitoring circuit 42-1 receives the cell start signal (RX_S
ATM cell data (RX_DA) led by OC # 1)
TA # 1) is recognized as ATM cell data (reception cell) of the PHY device 10-1 and a predetermined monitoring process is performed. When counting the number of received cells, a counter is provided and the number of received cells from the PHY device 10-1 is counted by counting the cell start signal (RX_SOC # 1).

Other PHY device identifying circuits 41-2 to 41-n of the cell monitoring unit 40 and cell monitoring circuits 42-2 to 42-2.
41-n also operates in the same manner and monitors the ATM cells of the corresponding PHY devices 10-2 to 10-n1.

In the above embodiment, UTOPI is used.
Although level 1 has been described as an example of the A reception interface signal, the same can be implemented with level 2. In this case, the reception address signal (RX_ADD # 0
~ # 4) can be used to identify the PHY device.

Further, as another embodiment of the present invention,
A case will be described where the present invention is applied to a UTOPIA transmission interface that transfers ATM cells from the ATM layer device 30 in the directions of the PHY devices 10-1 to 10-n, which is the reverse of the above-described embodiment (FIG. 1).

The configuration of this example is basically the same as the configuration shown in FIG. 1, and the signal names and signal directions are appropriately replaced. That is, the received ATM cell data (RX
_DATA # 1 to RX_DATA # n) is transmitted ATM cell data (TX_DATA # 1 to TX_DATA # n)
And the signal direction from the ATM layer device 30 to P
It is addressed to the HY devices 10-1 to 10-n. Receive cell start signals (RX_SOC # 1 to RX_SOC # n) are transmitted cell start signals (TX_SOC # 1 to TX_SOC # n)
And the signal direction from the ATM layer device 30 to P
It is addressed to the HY devices 10-1 to 10-n. Cell available signal (RX_CLAV # 1 to RX_CLAV # n) or cell empty signal (RX_EMPTY # 1 to RX_EMPT)
Y # n) is a signal (TX_FULL #) indicating whether or not cell input is possible.
1 to TX_FULL # n) and the signal direction is PHY
The devices 10-1 to 10-n are left as they are for the ATM layer device 30. Receive enable signal (RX_EN
Similarly, B # 1 to RX_ENB # n are also transmission enable signals (TX_ENB # 1 to TX_ENB # n), and the signal direction is kept from the ATM layer device 30 to the PHY devices 10-1 to 10-n.

Next, the operation of this example will be described with reference to the PHY device 10
-1 will be described as an example.

When the ATM layer device 30 has a transmission ATM cell for the PHY device 10-1, the TX layer device 30
_FULL # 1 is checked and PHY device 10-1
Determines whether the ATM cell can be input. If input is possible, the ATM layer device 30 is the PHY device 1
0-1, an ATM cell reception instruction and an enable signal TX_ENB # 1 indicating that the ATM cell is being effectively transmitted are transmitted, and at the same time as the cell start signal TX_SOC # 1, the AT signal is transmitted.
The M cell data TX_DATA # 1 is transmitted.

The PHY device identification circuit 41-1 of the cell monitoring unit 40 monitors the enable signal TX_ENB # 1 for the PHY device 10-1 and notifies the cell monitoring circuit 42-1 when a significant state is detected. Cell monitoring circuit 42
-1 outputs the ATM cell data TX_DATA # 1 which is led by the cell start signal TX_SOC # 1 at that time.
ATM cell data (transmission cell) to Y device 10-1
Then, a predetermined monitoring process is performed. When counting the number of received cells, it has a counter and cell start signal TX_S.
By counting OC # 1, the PHY device 10
Count the number of cells transmitted to -1.

Other PHY device identification circuits 41-2 to 4-4
1-n and the cell monitoring circuits 42-2 to 41-n also operate in the same manner, and the corresponding PHY devices 10-2 to 10-1.
Monitor ATM cells 0-n1.

Also in this example, the level 2 UTOPIA is used.
The same can be done for the transmission interface signal. In this case, the transmission address signal (TX_ADD #
0 to # 4) can be used to identify the PHY device.

In the above description, both the ATM cell monitoring unit for receiving cells and the ATM cell monitoring unit for transmitting cells are assumed to be outside the ATM layer device, but they may be built in the ATM layer device. it can.

[0036]

As described above, according to the present invention, the UTOPI
Since the A bus is used as it is, and the PHY device identifying means for identifying the PHY device by the signal on the UTOPIA bus is provided, the PHY device does not need to be newly added.
The ATM cell for each device can be monitored.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing an embodiment of the present invention.

FIG. 2 is a timing diagram illustrating the operation of the UTOPIA bus.

FIG. 3 is a block diagram showing a conventional technique.

[Explanation of symbols]

10-1, 10-2, ..., 10-n PHY device 20 UTOPIA bus 30 ATM layer devices 41-1, 41-2, ..., 41-n PHY device identification circuits 42-1, 42-2 ,. -N ATM cell monitoring circuit

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04L 12/28 H04L 12/24 H04L 12/26

Claims (7)

(57) [Claims] 1. A common UT for a plurality of physical layer devices
In a monitoring system for monitoring an ATM cell on a UTOPIA bus in an ATM device connected to an ATM layer device via an OPIA bus, the output of the ATM cell among signals output from the ATM layer device to the UTOPIA bus. The ATM cell transmission instruction to the physical layer device in the enabled state and the individual reception enable signal indicating the effective reception are transmitted.
Monitoring is performed as a device identification signal for identifying the output source physical layer device of the M cell, and each time the device identification signal is output, the output source physical layer device of the designated ATM cell is identified and the identification result is output. Physical layer device identification means for monitoring the ATM cells on the UTOPIA bus, and each time the identification result is output from the physical layer device identification means, the ATM cell at that time is identified by the physical layer indicated by the identification result. An ATM cell monitoring system comprising: an ATM cell monitoring means for monitoring a received ATM cell for each physical layer device by recognizing the ATM cell output from the device. 2. The ATM cell monitor according to claim 1, wherein the physical layer device identification means uses a reception address signal of a level 2 interface as the device identification signal instead of the reception enable signal. system. 3. A common UT for a plurality of physical layer devices
In a monitoring system for monitoring an ATM cell on a UTOPIA bus in an ATM device connected to an ATM layer device via an OPIA bus, an ATM cell input among signals output from the ATM layer device to the UTOPIA bus is provided. A separate transmission enable signal indicating the reception of an ATM cell to the physical layer device in the enabled state and the effective transmission is transmitted.
Monitoring is performed as a device identification signal for identifying the output destination physical layer device of the M cell, and each time the device identification signal is output, the output destination physical layer device of the specified ATM cell is identified and the identification result is output. Physical layer device identification means for monitoring the ATM cells on the UTOPIA bus, and each time the identification result is output from the physical layer device identification means, the ATM cell at that time is identified by the physical layer indicated by the identification result. An ATM cell monitoring system comprising: an ATM cell monitoring means for monitoring a transmission ATM cell for each physical layer device by recognizing the ATM cell addressed to the device. 4. The ATM cell monitor according to claim 3, wherein the physical layer device identifying means uses a level 2 interface transmission address signal as the device identification signal instead of the transmission enable signal. system. 5. An ATM layer device comprising both the ATM cell monitoring system according to claim 1 and the ATM cell monitoring system according to claim 3. 6. A common UT for a plurality of physical layer devices
In a monitoring method for monitoring an ATM cell on a UTOPIA bus in an ATM device connected to an ATM layer device via an OPIA bus, the output of an ATM cell among signals output from the ATM layer device to the UTOPIA bus. The ATM cell transmission instruction to the physical layer device in the enabled state and the individual reception enable signal indicating the effective reception are transmitted.
Monitoring is performed as a device identification signal for identifying the output source physical layer device of the M cell, and each time the device identification signal is output, the output source physical layer device of the designated ATM cell is identified, and the ATM at that time is identified. A output from the physical layer device indicated by the identification result of the cell
An ATM cell monitoring method, characterized in that a received ATM cell for each physical layer device is monitored by recognizing it as a TM cell. 7. A common UT for a plurality of physical layer devices
A monitoring method for monitoring an ATM cell on a UTOPIA bus in an ATM device connected to an ATM layer device via an OPIA bus, comprising: inputting an ATM cell among signals output from the ATM layer device to the UTOPIA bus. A separate transmission enable signal indicating the reception of an ATM cell to the physical layer device in the enabled state and the effective transmission is transmitted.
Monitoring is performed as a device identification signal for identifying the output destination physical layer device of the M cell, and each time the device identification signal is output, the output destination physical layer device of the designated ATM cell is identified, and the ATM at that time is identified. An ATM cell monitoring method, wherein a transmission ATM cell for each physical layer device is monitored by recognizing the cell as an ATM cell addressed to the physical layer device indicated by the identification result.